It's double the congratulations for Chris Hemsworth and his wife Elsa Pataky -- the two recently welcomed twin boys into the world! Pataky wasted no time in sharing her joy with her Instagram followers, posting a sweet picture of the twins' feet and announcing their names.

"They are already home. Tristan and Sasha arrived in this world 18 March just after the full moon," Pataky captioned the shot in Spanish, her native language.

"Complete happiness!!" she added.

The baby boys, who were born at the celeb-friendly Cedars-Sinai Medical Center hospital in Los Angeles, join big sister India Rose, who will turn two this May.

In 2013, Hemsworth spoke out about how parenthood has altered his life, saying it has changed him "for the better."

“It makes it harder and harder to leave and go to work,” Hemsworth also revealed to PEOPLE that same year. “Being a father is certainly a task. But [it's] the best one that I could ever ask for.”

Now with a brood of three (all under the age of three!), it looks like Hemsworth and Pataky have their hands full with their expanding family -- and they couldn't be happier about it, quietly settling into the routine of a five-member family.